BEYONCE, JAY-Z, KIM KARDASHIAN & KANYE WEST make for a great set of mixed doubles – but leave it jealous kin to butt heads!

SOLANGE KNOWLES is butting heads with big sis Beyonce – telling her she shouldn’t be hanging out with flashy, trashy Kim Kardashian.

She’s convinced that the “Keeping Up with the Kardashians” star is too lowbrow and tacky to be a friend of her superstar sister.

And now a family feud has erupted over Kim, who ironically is desperate to become even closer with Beyonce, say sources.

“In SOlange’s eyes, BEYONCE is a stand-out star, a premier singer of our time, whereas Kim is just a reality TV star who only got famous after a sex tape was leaked,” revealed an insider.

When Solange saw photos of the two enjoying each other’s company at a Kanye West/Jay-Z concert in England last month, it left a sour taste in her mouth.

“So she called Beyonce out on it, and they had a fight over Kim. It culminated with Beyonce telling Solange she can be friends with whomever she wants.”

In our July 16 issue, The ENQUIRER revealed that Kim, 31, was desperate to become BFFs with Beyonce, 30, and is spoiling the singer’s baby to get super-close.

The reality TV beauty even splashed on a $5,000 diamond-studded baby bracelet for Beyonce and Jay-Z’s 6-month-old daughter Blue Ivy.

She engraved it: “Love Auntie Kim,” but the source says even Beyonce thought that “was over the top.”